Is there a general rule regarding how much weight is okay for SRW and how much is too much? We are thinking of a larger 5er and not sure how much larger will require a new truck too.
Every truck of every brand, SRW or DRW, has a specified payload rating. And the specified payload rating for any truck, SRW or DRW, can vary considerably depending on that particular truck configuration. Example, an F350 SRW payload rating can vary as much as 1,000 lbs depending on cab, bed, engine, tires, etc. So there is no one number for all trucks.